Shares tumble on global growth concerns; Treasury yields fall

By Sam ForgioneNEW YORK (Reuters) – Stock indexes worldwide tumbled on Monday, led by banking stocks in Europe and technology stocks on Wall Street on persisting fears of a global economic slowdown, while benchmark 10-year Treasury yields hit their lowest in a year on demand for assets deemed less risky.European shares extended the previous week’s big losses, with the FTSEurofirst 300 index of top regional shares falling more than 3 percent to its lowest in 16 months. Cyclical sector